Pneumatic-tire cover.



J. T. JOHNSON & F. G. MASON.

'PNEUMATIG TIRE COVER. APPLIOATION 'I'ILED JULY 5, 1912.

Patented May 20 1913.

m: NURRJS Insns co. nwmumm. wuumumu. n. m

UNITED STATES PATENT OFFICE.

JOHN THOMAS JOHNSON A D FREDERICK GEORGE MASON, E OAULFIE'LD,VlZC'lORIA, AUSTRALIA.

PNEUMATIC-TIRE COVER.

Specification of Letters Patent.

Patented May 20, 1913.

Application filed J'u1y 5, 1,912; Serial No. 707,729.

To all whom it mayc0ncem:

Be 1tknownthat we, JOHN THoMAs J GEN- soN and FnEnERioK GEORGE MASON,both subjects of the King of Great Britain, re-.

5 siding at- Lindamere, Wanda Road, Caulfield, in the State of Victoriaand Commona wealth of Australia, have invented certain new and usefulImprovements in Pneumatic- Tire Covers, of which the following is aspecification. I

This invention relates to pneumatic tirev covers and to an improvedmethod of manufacturing the same described in our co-pend ingapplication Serial No; 752,557, filed Mar. 7, 1913. i

' Pneumatic tire covers are now built up of a series of strips of canvaswith 'or. without inter-lying rubber sheets arranged longitudinallyabout the tire, but itv has been found very difficultto cause thesuperposed sheets of canvas to perfectly-adhere in the curved andannular, form. It has been furim ortance that the adhesion of thematerials composing it shall be as nearly perfect as possible for thepurpose of withstand ng as one homogeneous whole, the excessive strainsto which a tire is subjected when.

9 in use.

In devising our invention we have paid special attention to obtainingthe best adhesion possible of the parts orming a tire cover, and haveillustrated the invention in the accompanying'drawings, 1n Wl110l1-Figure 1 is a plan showing the arrangement of parts used in forming acover. Fig. 2 shows in perspective vlew part of a pneumatic tire withthe arrangement of strips in accordance with the invention. Fig. 3 1s anenlarged sectional elevation on thehne '1-1 of Fig. 1, showing thelayers of rubber and canvas above and below the beads before the tire isfinally formed. Funfl 18 2111 enlargedview of part section, on llne 2-2with a strip or strips of canvas coated with In a pneumatic tire coverit is of prime of Fig. 1, showing two strips and attached rubbers.

In the construction of a pneumatic tire cover according to thisinvention, we first cutshort strips of a woven fabric out of a sheet ofmaterial. It is preferable to cut the strips on the bias" that is tosay,

'neitheralong the woof nor the'weft, but

across each. Each of the strips 5 is faced on both sides with a thinsheet of rubber 6, which may completely cover the fabric so that thelatter will becontained within a rubber envelop.

The strips are laid upon the head used in the-construction of the .tireand formed the' shape and about thesize of the inner tube of the tirebeing made, at an angle of about 45 with the face of the'wheel andconsequently whena second layer is laid on the first but from the otherdirection, such first and second layers will be at right angles to eachother.

Each of the strips 5 overlaps its neighbor and along each of its edges agutter is formed which if left unfilled will, owing to the number soconstituted, "be a. source of weakness; in the, cover by preventingtheproper vulcanization of the. parts into a solid mass.

To insure the best results in the construction of a. tire cover and fromthe subsequent v-ulcanizing -process we may cause the rub ber facmgs ofthe strips 5 to overlap on both edges for a distance suiflcieng when thestrips are laid, to come over the strips beneath and above and tooverlap each just enough to fill the gutters formed: by the con tiguousstTrips. This arrangement is shown in Fig. 1 of the drawings. i

In making a cover, the strips are laid overlapping each other across theformer or mold from the right to left and then a second series ofoverlapping strips is laid at right angles to thefirst lot from left toright. The number of layers used will depend upon the class of tirerequired; for

very heavy tires six or eight layers may be used, while for a lightserviceas few as two may be suflicient. For'ordinary tires four layerswill suflice, two being placed under the annular beads 7 and two overthe same.

Before commencing to lay the strips on "the head former or mold we placeupon the latter a rubber sheet which entirely covers the-same. Upontherubber sheet 8 manner shown in Fig. 1 and then to apply .tire issubjected during use.

To facilitate laying the strips on the former or mold we have found itconvenient to cut and lay the same on the bench in the theaggregation-to the former. When the requisite number of layers hasbeenput in position the edges of the aggregations of strips are rolledin the usual way upon the beads and when the tread of thetire has beenput in position the whole is placed in a heated tion.

Fig. 3 is intended to represent an exaggerated transverse section of acover where in is clearly depicted the manner in which the stripsover-la the rubber being shown crosshatehed in t e solid form aftervulcanization the better to distinguish the same from the strips '5shown in heavy lines.

press for the purpose of vulcaniza- ;ters Patent is '1; In apneumatictire cover a plurality of'layers, each layer comprising stripsof fabric extending in the same general cirec-' tion and each stripoverlapping the next adjacent strip on one side thereof andbeingioverlappedby the next adjacent 'strip on the other sidethereofeach of said fabric strips being faced on one surface with sheetsof rubber said rubber sheets extending beyondthe longitudinal edges ofsaid strips.

2-. In a pneui'nati'c tire cover, a plurality of layers, each of saidlayers comprising a plurality of overlapping strips,othe strips of eachlayer running in the same direction, a sheetof material for each stripcovering one face thereof and "a second sheet of material for each ofsaid strips covering .the other face thereof, said sheets being ofgreater width than'said strips; the strips and sheets of one layerextending at right angles to the strips of the, next adjacent layer, allof said sheets and strips being formed into one integral mass.

.In testimony whereof we have aflixed our signatures in presence of twowitnesses.

JOHN THOMAS JOHNSON. FREDERICK GEORGE MASON. \Vitn'esses:

' P. M. NEWTON,

M. ALLAN.

(lopies of this patent may be obtained for five cents each, byaddressing the Commissioner drama.

Washington, D. 0.

